v8.0.0-rc.11-dev.44: Add checked PSL entity references and explicit unchecked names (#30344)

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Linked issue Linear integration and ticket-prefixed naming explicitly waived by the operator. This is Slice 1 of the shared PSL value-specification work; Slice 2 is not implemented here. Summary This PR adds checked PSL entity references and explicit unchecked names, including SQL/Mongo inheritance consumers and existing attribute tooling. Checked references retain the selected declaration into lowering so validatio…

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